net: bridge: add per-port group_fwd_mask with less restrictions

We need to be able to transparently forward most link-local frames via
tunnels (e.g. vxlan, qinq). Currently the bridge's group_fwd_mask has a
mask which restricts the forwarding of STP and LACP, but we need to be able
to forward these over tunnels and control that forwarding on a per-port
basis thus add a new per-port group_fwd_mask option which only disallows
mac pause frames to be forwarded (they're always dropped anyway).
The patch does not change the current default situation - all of the others
are still restricted unless configured for forwarding.
We have successfully tested this patch with LACP and STP forwarding over
VxLAN and qinq tunnels.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2017-09-27 16:12:44 +03:00 committed by David S. Miller
parent de9c8a6a5f
commit 5af48b59f3
5 changed files with 42 additions and 2 deletions

View File

@ -325,6 +325,7 @@ enum {
IFLA_BRPORT_MCAST_TO_UCAST,
IFLA_BRPORT_VLAN_TUNNEL,
IFLA_BRPORT_BCAST_FLOOD,
IFLA_BRPORT_GROUP_FWD_MASK,
__IFLA_BRPORT_MAX
};
#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)

View File

@ -289,6 +289,7 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
*
* Others reserved for future standardization
*/
fwd_mask |= p->group_fwd_mask;
switch (dest[5]) {
case 0x00: /* Bridge Group Address */
/* If STP is turned off,

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@ -152,6 +152,7 @@ static inline size_t br_port_info_size(void)
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ nla_total_size(sizeof(u8)) /* IFLA_BRPORT_MULTICAST_ROUTER */
#endif
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_GROUP_FWD_MASK */
+ 0;
}
@ -208,7 +209,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
p->topology_change_ack) ||
nla_put_u8(skb, IFLA_BRPORT_CONFIG_PENDING, p->config_pending) ||
nla_put_u8(skb, IFLA_BRPORT_VLAN_TUNNEL, !!(p->flags &
BR_VLAN_TUNNEL)))
BR_VLAN_TUNNEL)) ||
nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask))
return -EMSGSIZE;
timerval = br_timer_value(&p->message_age_timer);
@ -637,6 +639,7 @@ static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
[IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 },
[IFLA_BRPORT_MCAST_FLOOD] = { .type = NLA_U8 },
[IFLA_BRPORT_BCAST_FLOOD] = { .type = NLA_U8 },
[IFLA_BRPORT_GROUP_FWD_MASK] = { .type = NLA_U16 },
};
/* Change the state of the port and notify spanning tree */
@ -773,6 +776,15 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
return err;
}
#endif
if (tb[IFLA_BRPORT_GROUP_FWD_MASK]) {
u16 fwd_mask = nla_get_u16(tb[IFLA_BRPORT_GROUP_FWD_MASK]);
if (fwd_mask & BR_GROUPFWD_MACPAUSE)
return -EINVAL;
p->group_fwd_mask = fwd_mask;
}
br_port_flags_change(p, old_flags ^ p->flags);
return 0;
}

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@ -36,7 +36,14 @@
/* Control of forwarding link local multicast */
#define BR_GROUPFWD_DEFAULT 0
/* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
#define BR_GROUPFWD_RESTRICTED 0x0007u
enum {
BR_GROUPFWD_STP = BIT(0),
BR_GROUPFWD_MACPAUSE = BIT(1),
BR_GROUPFWD_LACP = BIT(2),
};
#define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
BR_GROUPFWD_LACP)
/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
#define BR_GROUPFWD_8021AD 0xB801u
@ -268,6 +275,7 @@ struct net_bridge_port {
#ifdef CONFIG_NET_SWITCHDEV
int offload_fwd_mark;
#endif
u16 group_fwd_mask;
};
#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)

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@ -165,6 +165,23 @@ static int store_flush(struct net_bridge_port *p, unsigned long v)
}
static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
{
return sprintf(buf, "%#x\n", p->group_fwd_mask);
}
static int store_group_fwd_mask(struct net_bridge_port *p,
unsigned long v)
{
if (v & BR_GROUPFWD_MACPAUSE)
return -EINVAL;
p->group_fwd_mask = v;
return 0;
}
static BRPORT_ATTR(group_fwd_mask, S_IRUGO | S_IWUSR, show_group_fwd_mask,
store_group_fwd_mask);
BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
@ -223,6 +240,7 @@ static const struct brport_attribute *brport_attrs[] = {
&brport_attr_proxyarp_wifi,
&brport_attr_multicast_flood,
&brport_attr_broadcast_flood,
&brport_attr_group_fwd_mask,
NULL
};